I agree. This appears to be the problem: It seems that the hole of the lever is lined with some kind of a plastic tube and the crown is not springloaded. When the lever is closed -- the force is pretty strong -- what gives, is the lining in the lever hole and thus the end of the lever near the pin gets pushed out. If the lining of the lever whole has enough elasticity, then reducing the diameter of the roller of the lever might help. From what I can see without taking the CG apart, shaving the lever does not seem to be an option as there is not enough material because of the lining of the lever whole. Please bear in mind that I am guessing a bit as to how exactly the lever is constructed.